That is a tricky question. If the deceased cashed in the RRSP, then the estate will receive a T4RSP, but if the decease died with the funds still in the RRSP, then the inheritors must claim the income from the estate. The lawyer should have explained that.
The distribution of the estate will have to be declared to CRA when the estate makes a request for a TX19 Clearance Certificate.
If you're not familiar with final returns or estate distributions, you should consider referring the sons to someone with experience because a mistake could be very expensive for the inheritors in fines, penalties and interest.
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